Diet food (dietetic food) refers to any food or beverage whose recipe is altered to reduce fat, carbohydrates, and/or sugar in order to make it part of a weight loss program or diet. Such foods are usually intended to assist in weight loss or a change in body type, although bodybuilding suppliments are designed to increase weight. The process of making a diet version of a food usually requires finding an adequate low-food-energy substitute for some high-food-energy ingredient.